Can Sucking Breasts During Intercourse Effect Health?

HI SIR,
v r seeing ur prog reglarly,its very ne and helpful also andfrom ur seech we came t know so many things and problem als,then i have one doubt sir my friend husband when they r doing sex her husb needsboobs sucking more its good or not and she is afraid becoz of that she will get any problems like breast cancer likethat,sir i want answer pls immediately

thank u,
marry